Such is a story of a jams in general! I wonder what is causing the bug - generally items that greyout as an option were there, but not clickable... maybe it picked up items and run out of space somehow? Because I gathered all (or most) of the items before I got any encounter... They also would not disapear in the world itself - maybe that was something to do with it.
Don't get discoraged though! Critical bugs happen even for veteran jammers out there!